Interest in the scientific study of religion has surged over the past decade. While this development is positive in many ways, it comes largely for an unfortunate reason – global terrorism, exemplified most clearly by the September 11th attacks of ten years ago. Since many terrorist attacks since then have been committed by hardline Muslim believers, researchers have put extensive effort into elucidating the complex relationship between religion and violent acts. Now, a team of investigators is applying the principles of evolutionary psychology to help explain why the two are so often entwined.